drivers/misc/sram-exec.c

2  * SRAM protect-exec region helper functions
4  * Copyright (C) 2017 Texas Instruments Incorporated - https://www.ti.com/
33 	unsigned long base = (unsigned long)part->base;  in sram_check_protect_exec()
34 	unsigned long end = base + block->size;  in sram_check_protect_exec()
37 		dev_err(sram->dev,  in sram_check_protect_exec()
38 			"SRAM pool marked with 'protect-exec' is not page aligned and will not be created.\n");  in sram_check_protect_exec()
39 		return -ENOMEM;  in sram_check_protect_exec()
48 	list_add_tail(&part->list, &exec_pool_list);  in sram_add_protect_exec()
55  * sram_exec_copy - copy data to a protected executable region of sram
66  * of 'protect-exec' pools which are normal sram pools but are always set
67  * read-only and executable except when copying data to them, at which point
68  * they are set to read-write non-executable, to make sure no memory is
69  * writeable and executable at the same time. This region must be page-aligned
77  * making use of this functionality that guarantees a safe copy of exec
92 		if (p->pool == pool)  in sram_exec_copy()
103 	base = (unsigned long)part->base;  in sram_exec_copy()
106 	mutex_lock(&part->lock);  in sram_exec_copy()
124 	mutex_unlock(&part->lock);  in sram_exec_copy()
129 	mutex_unlock(&part->lock);  in sram_exec_copy()